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media: dt-bindings: media: max9286: Document 'maxim,reverse-channel-microvolt'

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Document the 'maxim,reverse-channel-microvolt' vendor property in the
bindings document of the max9286 driver.

The newly introduced property allows to specify the initial
configuration of the GMSL reverse control channel to accommodate
remote serializers pre-programmed with the high threshold power
supply noise immunity enabled.

Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Jacopo Mondi 2021-01-14 18:04:26 +01:00 committed by Mauro Carvalho Chehab
parent a59f853b3b
commit c00b724913
1 changed files with 22 additions and 0 deletions
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22
Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
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@ -50,6 +50,26 @@ properties:
'#gpio-cells':
const: 2
maxim,reverse-channel-microvolt:
minimum: 30000
maximum: 200000
default: 170000
description: |
Initial amplitude of the reverse control channel, in micro volts.
The initial amplitude shall be adjusted to a value compatible with the
configuration of the connected remote serializer.
Some camera modules (for example RDACM20) include an on-board MCU that
pre-programs the embedded serializer with power supply noise immunity
(high-threshold) enabled. A typical value of the deserializer's reverse
channel amplitude to communicate with pre-programmed serializers is
170000 micro volts.
A typical value for the reverse channel amplitude to communicate with
a remote serializer whose high-threshold noise immunity is not enabled
is 100000 micro volts
ports:
$ref: /schemas/graph.yaml#/properties/ports
@ -185,6 +205,8 @@ examples:
gpio-controller;
#gpio-cells = <2>;
maxim,reverse-channel-microvolt = <170000>;
ports {
#address-cells = <1>;
#size-cells = <0>;